From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: Building of arch/arm/plat-mxc/ssi-fiq.S failed w/ THUMB2 enabled?
Date: Fri, 20 Jan 2012 11:56:06 +0000 [thread overview]
Message-ID: <20120120115606.GL1068@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20111202133911.GC2892@localhost.localdomain>
On Fri, Dec 02, 2011 at 01:39:11PM +0000, Dave Martin wrote:
> Is this code still used on ARMv7 and above? FIQ is not normally
> available for Linux interrupts on hardware which makes use of the
> TrustZone security extensions. Plus, on modern hardware with a deep
> memory hierarchy, FIQ is may not be all that "fast" either, due to
> cache/TLB effects.
It's worth pointing out that people end up using FIQs for certain things
because the hardware requires you to do it. So if a platform is using
them, they're probably not doing it out of choice, but are doing it
because it's a baseline requirement to get something working.
next prev parent reply other threads:[~2012-01-20 11:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-02 10:01 Building of arch/arm/plat-mxc/ssi-fiq.S failed w/ THUMB2 enabled? Eric Miao
2011-12-02 10:24 ` Uwe Kleine-König
2011-12-02 13:39 ` Dave Martin
2012-01-20 11:22 ` Dave Martin
2012-01-20 11:56 ` Russell King - ARM Linux [this message]
2012-01-20 15:02 ` Dave Martin
2012-01-20 11:52 ` Russell King - ARM Linux
2012-01-20 12:00 ` Dave Martin
2012-01-23 11:59 ` Sascha Hauer
2012-01-25 14:06 ` Matt Sealey
2012-01-25 14:34 ` Russell King - ARM Linux
2012-01-25 17:23 ` Sascha Hauer
2012-01-30 13:57 ` Dave Martin
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